Analysis on SSR Information of EST Resources of Kiwifruit(Actinidia ssp.)
摘要
[Objective]The aim was to make better use of the EST-SSR resources of kiwifruit for further molecular biological studies and new EST-SSR marker development by screening and mining the SSR repeats in the EST database of kiwifruit(Actinidia spp.)[Method]56 400 of EST sequences were randomly selected from EST(Expressed Sequence Tag) sequences of kiwifruit in the database of NCBI.EST sequences were analyzed and the SSR(Microsatellite)was screened by using the SSRHunter software.[Result]7 939 SSRs were identified from the randomly selected kiwifruit EST resources,among which there were 5 131(64.63%)dinucleotide,1 237(15.58%)trinucleotide,284(3.58%)tetra nucleotide,397(5.00%)pentanucleotide and 890(11.21%)hexanucleotide SSRs.Among the dinucleotide sequences,AG/CT repeat motif was accounted for 4 654(90.70%).The frequency of SSRs was approximately 1/2.48 kb,which could exist to 1 SSR in 7 unigenes.[Conclusion] The dinucleotide repeats appeared to be the most abundant SSRs,followed by the trinucleotide and hexanucleotide repeats.Among them the repeat motif such as AG/CT was predominant in each type of SSRs.